Pull up Assembly of the MySQL classes as a protected property, so that it can be overwritten in subclasses. That way extensions can decide in which assembly migration resources should be looked up. This is just a refactor -- no functional changes whatsoever.

OpenSim/Data/MySQL/MySQLAssetData.cs

@@ -47,6 +47,11 @@ namespace OpenSim.Data.MySQL
         private string m_connectionString;
         private object m_dbLock = new object();
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         #region IPlugin Members
 
         public override string Version { get { return "1.0.0.0"; } }
@@ -66,13 +71,10 @@ namespace OpenSim.Data.MySQL
         {
             m_connectionString = connect;
 
-            // This actually does the roll forward assembly stuff
-            Assembly assem = GetType().Assembly;
-
             using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
             {
                 dbcon.Open();
-                Migration m = new Migration(dbcon, assem, "AssetStore");
+                Migration m = new Migration(dbcon, Assembly, "AssetStore");
                 m.Update();
             }
         }

OpenSim/Data/MySQL/MySQLAuthenticationData.cs

@@ -28,6 +28,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Reflection;
 using System.Data;
 using OpenMetaverse;
 using OpenSim.Framework;
@@ -42,6 +43,11 @@ namespace OpenSim.Data.MySQL
         private int m_LastExpire;
         // private string m_connectionString;
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         public MySqlAuthenticationData(string connectionString, string realm)
                 : base(connectionString)
         {
@@ -51,7 +57,7 @@ namespace OpenSim.Data.MySQL
             using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
             {
                 dbcon.Open();
-                Migration m = new Migration(dbcon, GetType().Assembly, "AuthStore");
+                Migration m = new Migration(dbcon, Assembly, "AuthStore");
                 m.Update();
             }
         }

OpenSim/Data/MySQL/MySQLEstateData.cs

@@ -54,6 +54,11 @@ namespace OpenSim.Data.MySQL
         private Dictionary<string, FieldInfo> m_FieldMap =
                 new Dictionary<string, FieldInfo>();
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         public MySQLEstateStore()
         {
         }
@@ -82,8 +87,7 @@ namespace OpenSim.Data.MySQL
             {
                 dbcon.Open();
 
-                Assembly assem = GetType().Assembly;
+                Migration m = new Migration(dbcon, Assembly, "EstateStore");
-                Migration m = new Migration(dbcon, assem, "EstateStore");
                 m.Update();
 
                 Type t = typeof(EstateSettings);

OpenSim/Data/MySQL/MySQLGenericTableHandler.cs

@@ -46,6 +46,11 @@ namespace OpenSim.Data.MySQL
         protected string m_Realm;
         protected FieldInfo m_DataField = null;
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         public MySQLGenericTableHandler(string connectionString,
                 string realm, string storeName) : base(connectionString)
         {
@@ -57,7 +62,7 @@ namespace OpenSim.Data.MySQL
                 using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
                 {
                     dbcon.Open();
-                    Migration m = new Migration(dbcon, GetType().Assembly, storeName);
+                    Migration m = new Migration(dbcon, Assembly, storeName);
                     m.Update();
                 }
             }

OpenSim/Data/MySQL/MySQLRegionData.cs

@@ -29,6 +29,8 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Data;
+using System.Reflection;
+
 using OpenMetaverse;
 using OpenSim.Framework;
 using OpenSim.Data;
@@ -42,6 +44,11 @@ namespace OpenSim.Data.MySQL
         private List<string> m_ColumnNames;
         //private string m_connectionString;
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         public MySqlRegionData(string connectionString, string realm)
                 : base(connectionString)
         {
@@ -51,7 +58,7 @@ namespace OpenSim.Data.MySQL
             using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
             {
                 dbcon.Open();
-                Migration m = new Migration(dbcon, GetType().Assembly, "GridStore");
+                Migration m = new Migration(dbcon, Assembly, "GridStore");
                 m.Update();
             }
         }

OpenSim/Data/MySQL/MySQLSimulationData.cs

@@ -52,6 +52,11 @@ namespace OpenSim.Data.MySQL
         private string m_connectionString;
         private object m_dbLock = new object();
 
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
         public MySQLSimulationData()
         {
         }
@@ -71,8 +76,7 @@ namespace OpenSim.Data.MySQL
 
                 // Apply new Migrations
                 //
-                Assembly assem = GetType().Assembly;
+                Migration m = new Migration(dbcon, Assembly, "RegionStore");
-                Migration m = new Migration(dbcon, assem, "RegionStore");
                 m.Update();
 
                 // Clean dropped attachments